Actor: Keir Dullea

Keir Dullea played Dave Bowman in 2001: A Space Odyssey, a performance that is deliberately flat because Kubrick wanted the human characters less expressive than the computer.

The line about opening the pod bay doors is delivered with a calm that makes it more frightening, and the sequence disabling HAL is played almost entirely in silence.

Black Christmas gives him a very different role, and he has worked extensively on stage. He returned briefly for 2010.